BS 5535:1978

This standard BS 5535:1978 Specification for right angle and box angle plates is classified in these ICS categories:

• 25.060.20 Dividing and tool-workpiece holding devices

This British Standard relates to angle plates ranging in size from 60 mm × 50 mm to 600 mm × 500 mm. Successive sizes are in a series in which the dimensions increase by about the same ratio throughout.

Three grades, viz AA, A, and B, are provided according to three magnitudes of tolerance for squareness and the associated properties of flatness and parallelism of surfaces.

Provides for three grades of plates made from steel, cast iron or granite in the size range 60 x 50 mm to 600 x 500 mm. Nomenclature, material finish, design, sizes, accuracy, matched pairs, protection and marking. Appendix recommends types of plain and alloy cast iron and method of heat treatment.